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CEL issue follow-up; PCM software patch

3594 Views 0 Replies 1 Participant Last post by  billdzw
Posted earlier (counting myself lucky…) regarding my first CEL issue. Figured readers of this forum might be interested in the resolution.

We had the initial discussion about possible causes, to include DEF system, catalytic converter, etc. I shuffled off to the waiting room expecting nothing but bad news. Within an hour, my truck was ready to go and the CEL was off. Here's the deal…

Chrysler issued Service Bulletin #18-021-15 REV. C on June 10, 2015 (supersedes 18-021-15 REV.B, 5/28/15). This service bulletin states, in part…

"This bulletin involves reprogramming the Powertrain Control Module (PCM) with the latest available software. It also involve replacement of the Oxygen (O2) Sensor and cleaning or replacement of the Exhaust Gast Temperature (EGT) Sensor 1/2 if necessary depending on Diagnostic Trouble Codes (DTC) that may have set."

The bulletin applies to 2014 EcoDiesels. The bulletin continues…

"A small number of customers may experience an intermittent engine shudder or vibration which may not set a Diagnostic Trouble Code (DTC). In addition other customers may experience a Malfunction Indicator Lamp (MIL) [a.k.a., CEL] illumination upon which the technician may find one or more of the following DTCs…"

The bulletin then lists 38 error codes! The upgraded software also addresses enhancements to improve A/C compressor relay duty cycle operation to prevent ignition off battery draw and powertrain system improvements to enable EGR cleaning routine.

So… an iterative fix: (1) software upgrade, (2) if problem continues, replace the O2 and/or EGT sensors. I drove out with just the software upgrade and no CEL light.

Keeping my fingers crossed since I'm leaving for vacation next week.
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